When I started my N64 collection I went with the regular horizontal covers here on TCP simply because not all of my games had the vertical covers available, and I was just lazy and didn't want to make them myself. (
HUGE thank you to those that do take the time to do all of these)
After a while of looking at my shelves with the NES. SNES, and N64 games all sitting side by side, I realized I wanted my N64 games to match the same look of the NES and SNES (vertical) spines I was using. So instead of recreating all covers in the vertical format I simply took the horizontal covers already here on the site, and re-worked them a bit adding a vertical style spine to them, as you can see with Super Smash Bros.

They look really good sitting on the shelf since all you can see is the spine anyway, they fit right in with the NES and vertical SNES covers I have.
These are literally the
exact same as the regular horizontal covers (size, details, etc...) just with a different spine, and a
few minor tweaks here and there to keep them consistent.
https://drive.google.com/folderview?id=0BzLa9fgZNcqQSTF1SzI1Wm9neE0&usp=sharing <-- That is a link to my Google Drive folder where I am putting all my custom N64 covers. They aren't all done, as I don't have a complete collection. I am just putting this here incase people want to use them.
Feel free to request one if you like them, if not, it's cool no big deal. Just another option for people
